Towards flexible cogeneration - Techno-economic optimization of advanced combined cycle combined heat and power plants integrated with heat pumps and thermal energy storage

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Guédez, Rafael Graziano, Giovanni 2018-11-13T13:32:52Z 2018-11-13T13:32:52Z 2018-10-29
dc.description.abstract The liberalization of electricity markets and a growing penetration of renewables is changing operation of electrical grids. The boundary conditions for the operation of conventional power plants are changing and, as such, an improved understanding of the varying loads and prices on the electricity grid is required to assess the performance of emerging combined cycle gas turbine (CCGT) concepts and to further optimize their design for these new markets in the pursuit of increasing their profitability, especially when considering combined heat and power (CHP). To increase the flexibility of CCGT-CHP plants, three new plant layouts have been investigated by integrating different storage concepts and heat pumps in key sections of the traditional plant layout. The present study analyses the influence that market has on determining the optimum CCGT-CHP plant layout that maximizes profits (in terms of plant configuration, sizing and operation strategies) for a given location nearby Turin, Italy, for which hourly electricity and heat prices, as well as meteorological data, have been gathered. A multi-parameter approach for design and operation was followed using KTH’s and EPS’ techno-economic modeling tool DYESOPT. Results are shown by means of a comparative analysis between optimal plants found for each layout and the state-of-the art CCGT-CHP. It is shown that a plant configuration in which a cold storage unit is integrated together with a heat pump at the inlet of the gas turbine unit increases the net present value of the plant by approximately 0.3% when compared against conventional plant layouts. Using the same concept with a heat pump alone can improve lifetime profitability by 1.6%. A layout where district heating supply water is preheated with a combination of a heat pump with hot thermal tank increases plant profitability by up to 0.5%. This work has been performed as part of the PUMP-HEAT project, an EU Horizon 2020 research project in which KTH collaborates with other 13 stakeholders including industry and research institutions. The results will directly influence future work of the project. en
dc.format.extent 106
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Towards flexible cogeneration - Techno-economic optimization of advanced combined cycle combined heat and power plants integrated with heat pumps and thermal energy storage en
dc.type G2 Pro gradu, diplomityö fi Insinööritieteiden korkeakoulu fi
dc.subject.keyword co-generation en
dc.subject.keyword power plant flexibility en
dc.subject.keyword combined cycles en
dc.subject.keyword combined heat and power en
dc.subject.keyword thermal storage en
dc.subject.keyword heat pump en
dc.identifier.urn URN:NBN:fi:aalto-201811135733
dc.programme.major fi
dc.programme.mcode ENG215 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Järvinen, Mika
dc.programme Nordic Master Programme in Innovative and Sustainable Energy Engineering (ISEE) fi
local.aalto.electroniconly yes
local.aalto.openaccess yes

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